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A bullet of mass m moving with velocity ...

A bullet of mass m moving with velocity `upsilon_(1)` strikes a suspended wooden block of mass M as shown in the figure and sticks to it. If the block rises to a height y. the initial of the bullet is

A

`v_(1)=(m+M)/(m)sqrt(2gy)`

B

`v_(1)=sqrt(2gy)`

C

`v_(1)=(M+m)/(M)sqrt(2gy)`

D

`v_(1)=(m)/(m+M)sqrt(2gy)`

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The correct Answer is:
A
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